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golden-yarrow, yellow-yarrow

Photo is of parent taxon

golden-yarrow

Habit Shrubs, 20–50(–100) cm.
Stems

erect (woolly).

Leaves

(proximal usually mostly alternate): blades cuneate to obovate, 0.5–5 cm (the longer 1–2-pinnately lobed, lobes linear, the shorter 3–5-lobed or -toothed), ultimate margins entire, revolute, abaxial faces woolly, adaxial usually glabrate (distal leaves gradually reduced in size and lobing).

blades cuneate to obovate, 0.5–5 cm, the larger 1–2-pinnately lobed, lobes linear, the smaller 3–5-lobed or -toothed.

Peduncles

mostly 0–2.5(–9) cm.

0–1(–2) cm.

Involucres

campanulate, 3–7 mm diam.

3–5 mm diam.

Ray florets

0 or 4–6(–8);

laminae golden yellow, 2–5 (× 1.5–3) mm.

usually 4–6, rarely 0;

laminae 2–4 mm.

Disc florets

10–75;

corollas 2–4 mm.

10–35;

corollas 2–3 mm.

Phyllaries

4–7, distinct or connate at bases (broadly elliptic or ovate, carinate, apices obtuse or acute).

4–6, broadly elliptic, apices obtuse.

Heads

(3–)4–7(–10) or 10–30+ per array.

10–30+ per array.

Cypselae

1.5–3.5 mm;

pappi of 2–14 cuneate to oblanceolate (subequal), erose scales 0.5–1.3 mm.

1.5–3 mm;

pappi 0.5–1 mm.

2n

= 16, 32, 48, 64.

Eriophyllum confertiflorum

Eriophyllum confertiflorum var. confertiflorum

Phenology Flowering Mar–Jul.
Habitat Dry, sandy to rocky sites, coastal scrub to forest communities
Elevation 0–3500 m (0–11500 ft)
Distribution
from FNA
CA; Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; Mexico
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Members of var. confertiflorum complex hybridize with at least four varieties of Eriophyllum lanatum. Eriophyllum latilobum, E. jepsonii, E. confertiflorum var. tanacetiflorum, and some populations of E. confertiflorum var. confertiflorum with larger, broader leaves and longer peduncles may have resulted from such hybridizations (L. Constance 1937; P. A. Munz 1959; J. S. Mooring 1994).

Some southern California Indian tribes used var. confertiflorum as a remedy for rheumatism (E. C. Jaeger 1941). It has been introduced into cultivation as an ornamental.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Heads 10–30+ per array; peduncles 0–1(–2) cm; involucres 3–5 mm diam.; disc corollas 2–3 mm
var. confertiflorum
1. Heads (3–)4–7(–10) per array; peduncles 0–2.5(–9) cm; involucres 5–7 mm diam.; disc corollas 3.5–4 mm
var. tanacetiflorum
Source FNA vol. 21, p. 361. FNA vol. 21, p. 361.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Baeriinae > Eriophyllum Asteraceae > tribe Heliantheae > subtribe Baeriinae > Eriophyllum > Eriophyllum confertiflorum
Sibling taxa
E. ambiguum, E. congdonii, E. jepsonii, E. lanatum, E. lanosum, E. latilobum, E. mohavense, E. multicaule, E. nubigenum, E. pringlei, E. staechadifolium, E. wallacei
E. confertiflorum var. tanacetiflorum
Subordinate taxa
E. confertiflorum var. confertiflorum, E. confertiflorum var. tanacetiflorum
Synonyms Bahia confertiflora E. confertiflorum var. latum, E. confertiflorum var. laxiflorum
Name authority (de Candolle) A. Gray: Proc. Amer. Acad. Arts 19: 25. (1883) unknown
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